Some agronomical characters of twelve single-cross maize hybrids were investigated at five different locations in Hungary over a three-year period. The characters examined were individual plant production (total mass of the ears on a single plant), thousand-kernel mass, number of kernel rows, ear length, number of kernels per row, shelling % and the assimilating leaf area above the main ear. Among these yield components, the individual plant production, the ear length, the number of kernels per row and the grain-cob ratio (shelling %) were influenced to the greatest extent by the year, followed by the variety and the location. The greatest average yield was achieved by the tested hybrids at all five locations in 1997 (263 g/plant). The average yields in 1998 and 1999 were significantly lower (221 and 203 g/plant, respectively). The outstanding yields achieved in 1997 could be attributed to the favourable ecological conditions, which led to the development of secondary ears in Keszthely and Sopronhorpács. At the other three locations there was only one ear per plant, but these ears were longer than in the following years. The greatest year effect was recorded in Sopronhorpács, where the individual plant production amounted to 305 g/plant in 1997 and 238 g/plant in the worst year, 1999. In Gyöngyös conditions were very dry in all three years, so the year effect was least pronounced at this location (grand mean of 195 g/plant in 1997 and 201 g/plant in 1999). Stability analysis was carried out using the coefficient of variance for individual plant production. Hybrids Mv 3, Mv 5, Mv 9 and Mv 12 were found to have the best adaptability. The shelling % was not significantly influenced by the location; the grain-cob ratio is relatively stable for maize hybrids. A correlation was found between the individual plant production and the leaf area above the main ear (R2=0.658). Hybrids with the largest leaf area above the main ear also had the greatest ear mass.
Pavlicic, J. (1974): Variability of some quantitative characters of domestic types of maize flints (Montenegro flints). Savremena Poljoprivreda, 22, 49-57.
'Variability of some quantitative characters of domestic types of maize flints ' () 22 Montenegro flints). Savremena Poljoprivreda : 49 -57 .
Polerecky, O. (1976): Yield and yield components of newly-bred high-yielding grain maize hybrids. Rostlinna Vyroba, 22, 1021-1027.
'Yield and yield components of newly-bred high-yielding grain maize hybrids ' () 22 Rostlinna Vyroba : 1021 -1027 .
Salazar, A. M., Hallauer, A. R. (1986): Divergent mass selection for ear length in maize. Revista Brasileira de Genetica, 9, 281-294.
'Divergent mass selection for ear length in maize ' () 9 Revista Brasileira de Genetica : 281 -294 .
Marton, L. C., Berzsenyi, Z., Szundy, T., Árendás, T., Bónis, P. (1999): Különböző tenyészidejő kukoricahibridek termőképességének és szemnedvességének összehasonlító értékelése. (Comparative evaluation of the yield potential and grain moisture of maize hybrids with various vegetation periods.) pp. 85-89. In: Ruzsányi, L., Lesznyák, M., Jávor, A. (eds.), Tiszántüli Mezőǵzdasági Tud. Napok, Debrecen.
Tiszántüli Mezőǵzdasági Tud. Napok , () 85 -89 .
Mathur, R. K., Chuni, L., Bhatnagar, S. K., Jain, V. K., Gor, H. K. (1997): Effect of growing conditions on character association in maize (Zea mays L.). Annals of Agricultural Research, 18, 503-507.
'Effect of growing conditions on character association in maize ' () 18 Zea mays L.). Annals of Agricultural Research : 503 -507 .
Montgomery, E. G. (1906): What is an ear of corn? Popular Sci. Mon., 68, 55-62.
'What is an ear of corn? ' () 68 Popular Sci. Mon. : 55 -62 .
Vulchinkov, S., Vulchinkova, P., Tomov, N. (1995): Effect of genotype and environmental conditions on variation in harvest index in maize hybrids. Rasteniev"dni-Nauki, 32, 104-107.
'Effect of genotype and environmental conditions on variation in harvest index in maize hybrids ' () 32 Rasteniev"dni-Nauki : 104 -107 .
Seka, D., Cross, H. Z. (1995): Xenia and maternal effect on agronomic traits at three plant densities. Crop Science, 35, 86-90.
'Xenia and maternal effect on agronomic traits at three plant densities ' () 35 Crop Science : 86 -90 .
Szél, S. (1998): Hibridválasztás. (Choice of hybrids.) In: Sziberth, D., Széll E. (eds.), Amit a kukoricatermesztésről a gyakorlatban tudni kell. (All you need to know about maize production in practice.) Agroinform Kiadó, Budapest.
Amit a kukoricatermesztésről a gyakorlatban tudni kell. (All you need to know about maize production in practice.) , ().
Veneni, M. (1974): Studium komponentov urodnosti niektorych zavlazovanych hyridov kukurice. Vedecke Prace Vyskumneho Ustavu Zavlahoveho Hospodarstva v Bratislave, 1971---1972. 9, 147-178.
'Studium komponentov urodnosti niektorych zavlazovanych hyridov kukurice ' () 9 Vedecke Prace Vyskumneho Ustavu Zavlahoveho Hospodarstva v Bratislave : 147 -178 .
Villax, Ö. (1944): Növénynemesítés. I. (Plant Breeding. I.) Magyaróvár.
Kapás, S. (1961): A kukorica fajtabírálat egyes kérdései. (Questions involved in the adjudication of maize varieties.) Növényfajtaminősítő Tanács Titkárságának Kiadvány, Budapest. pp. 152-158.
A kukorica fajtabírálat egyes kérdései. (Questions involved in the adjudication of maize varieties.) , () 152 -158 .
Kim, S. K. (1975): Genotype environmental interactions of several agronomic traits of maize. Korean Journal of Breeding Yuk Jong Hak Joi Ji., 7, 163---169.
'Genotype environmental interactions of several agronomic traits of maize ' () 7 Korean Journal of Breeding Yuk Jong Hak Joi Ji. : 163 -169 .
Duncan, W. G. (1975): Maize. pp. 23-50. In: Evans, L. T. (ed.), Crop Physiology. Cambridge University Press, Cambridge.
Crop Physiology , () 23 -50 .
Gyenesné Hegyi, Z. (2000): A beltenyésztett törzsek és a hibridek terméselemeinek stabilitása. (Stability of yield components in inbred lines and hybrids.) MartonVásár, 2000/2, 24-25.
'A beltenyésztett törzsek és a hibridek terméselemeinek stabilitása. (Stability of yield components in inbred lines and hybrids.) ' () 2000/2 MartonVásár : 24 -25 .
Gyenesné Hegyi, Z., Pók, I., Illés, O., Szőke, C., Kizmus, L., Marton, L. C. (2002): A termőhely, a tőám és az évjárat hatása kukoricahibridek terméselemeire. (Effect of growing site, plant density and year on the yield components of maize hybrids.) Növénytermelés, 51, 425-435.
'A termőhely, a tőám és az évjárat hatása kukoricahibridek terméselemeire. (Effect of growing site, plant density and year on the yield components of maize hybrids.) ' () 51 Növénytermelés : 425 -435 .
Hallauer, A. R., Miranda, J. B. (1981): Hereditary variance: Experimental estimates. In: Quantitative Genetics in Maize Breeding. Iowa State University Press, Ames, Iowa. pp. 115-158.
Quantitative Genetics in Maize Breeding , () 115 -158 .
Horner, E. S., Chapman, W. H., Lundy, H. W., Lutrick, M. C. (1971): Hybrid-environmental interactions in corn. Proceedings, Soil and Crop Science Society of Florida, 31, 64-66.
'Hybrid-environmental interactions in corn ' () 31 Proceedings, Soil and Crop Science Society of Florida : 64 -66 .
Lucas, E. O., Remison, S. U. (1984): Effect of population density on yield and dry-matter partition of maize varieties in Nigeria. Indian Journal of Agricultural Science, 54, 284-290.
'Effect of population density on yield and dry-matter partition of maize varieties in Nigeria ' () 54 Indian Journal of Agricultural Science : 284 -290 .
Berényi, D. (1945): A kukorica termelése és összefüggése az időjárással. (Maize production and its correlation with the weather.) Alföldi Magvető, Debrecen.
Alföldi Magvető , ().
Dornescu, A. (1979): Expression of the intensity of heterosis in maize under various environmental conditions. Lucrari Stiintifice, Institutul Agronomic "Ion Ionescu de la Brad". Agronomie, 23, 35-38.
'Expression of the intensity of heterosis in maize under various environmental conditions. Lucrari Stiintifice, Institutul Agronomic "Ion Ionescu de la Brad" ' () 23 Agronomie : 35 -38 .